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<p><strong>Danh sách hàm , class</strong></p>
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    <td width="279"><strong>Tên hàm , class</strong></td>
    <td width="695"><strong>Công dụng</strong></td>
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    <td>chuoi_union_dulieu</td>
    <td>Lấy dữ liệu sản phẩm dựa vào id menu (đa cấp)</td>
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    <td>dem_dulieu_vghj</td>
    <td>Đếm số sản phẩm dựa vào id menu (đa cấp)</td>
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